巧算下列各题
问题描述:
巧算下列各题
(1)(4.5x7.5x4.8)÷(1.5x2.5x2.4)
(2)(51x68x78)÷(17x34x1.3)
(3)(0.81x0.75x0.48)÷(0.25x0.24x0.27)
(4)(0.39x0.7)÷(0.56x3.9)
答
(1)(4.5x7.5x4.8)÷(1.5x2.5x2.4)=(4.5/1.5)x(7.5/2.5)x(4.8/2.4)=3x3x2=18(2)(51x68x78)÷(17x34x1.3)=(51/17)x(68/34)x(78/1.3)=3x2x60=360(3)(0.81x0.75x0.48)÷(0.25x0.24x0.27)=...